Hi
How is the chemical composition of water on other planets different from our own? I haven’t been able to find out anything on the chemical composition of water that exists elsewhere in our galaxy and beyond. Is it like ours, H2O?
I look forward to your feedback.
davidmich
If it were not H2O, it would not be water.
What impurities are dissolved in it (like the salt in our oceans, or the carbon compounds in the land-scum) are likely to be very different.
I suppose in some extreme conditions Deuterium Oxide 2H2O or D2O (Heavy Water) might exist.
By your question - I assume you probably are curious about the environment on other planets and how it compares to ours. You probably did know that water is H20 - so I’m going to go out on a limb and say maybe you’d be more interested in something like this:
It provides some details on how the environment is suspected to be compared to ours. As any fan of Star Trek knows - you don’t want to go to any planet that isn’t “Class M” without special equipment. Class M isn’t a real term, but obviously the concept of classifying different planets based on how they’d be suitable for humans makes sense - and that wiki link has some good info.
I don’t understand all of it - and my guess is - other than the planets in our own solar system - much of this is based on very indirect measurements of those planets and their systems.
Water is H2O; H2O is water. Anything that is not H2O is not water. The chemical composition of water, no matter where it is in the universe, is H2O.
Your question does not make sense.
It is possible that there might be differentphysical phases of water occurring, but those all have the same chemical composition.
Even the parts that are OH- or H30+?[/nitpick]
Water is H20 but as we experience water it is rarely just H20, there are various salts and minerals in pretty much all of its natural forms that change its quality and I presume the OP is asking about that. The simple answer is that we’ve never sampled water on another planet and don’t know. In fact, scientists can only speculate about the existence of water on other planets; there’s non within reach with water.
Water has a completely different chemical composition on Twin Earth. 
You might mean, what liquids cover other planets the way water does on this one. If that is the case, there is a whole slew of answers including diamond.
Water is water…except when it’s dihydrogen monoxide.
Know the risks!
Some companies even put that chemical in sugary drinks!! :eek:
Really? You reserve the word “water” for pure H2O? You have never ordered a glass of “water” in a restaurant, or bought a bottle of “water” from a convenience store, or filled your home sink or bathtub with “water”? What do you call those liquids if not water?
I’m curious what do you think the chemical composition of tap or restaurant water is? H2O is water. Water may have substances dissolved in it (minerals or sugar, for example) but the solvent is water, which is H2O. It may dissociate in solution, but that’s still it’s chemical composition.
Now another alien life may coincidentally call the universal solvent on their planet “water”, and it may be chemically different I suppose. But here, the chemical comp of what we call water is H2O, dissolved solutes notwithstanding.
In common parlance “water” usually refers not just to H2O but also to any dissolved substances in it. That’s why when I order “water” in a restaurant I don’t complain and send it back when they bring me a glass of liquid which contains measurable or even visible quantities of carbon dioxide, calcium, etc. I take it the OP understands that Earth water normally contains such dissolved solids and gases and was asking whether the same is true of water found elsewhere in the solar system.
I must respectfully disagree with your interpretation of the OP, given the line "Is it like ours, H2O? "
This leads me to believe that he thinks water might be something other than basically H2O on anther planet.
Until he returns to clarify that he is asking about different impurities, or whether a different substance could form clouds and oceans, we must presume he is asking whether water is water.
I thought that was “Jin’n’Tonnix”.
The OP didn’t ask about other “dissolved substances in it”, he asked about a different chemical composition than H2O.
However, even in common parlance, what water is doesn’t change. Sure, mineral water and distilled water might both be called water, but if H2O2 started coming out of the tap, no one would call it water. So, we may understand that H2O with minerals dissolved in it can still be called water, nothing with a different chemical composition ever would be.
The OP was very specific in asking about the chemical composition of water on another planet, and that drove the answers he was getting.
Some idiots encourage their children to play with it! :smack: